Wrc had the battle of Subaru vs Mitsubishi and the celica gt4 bending the rules massively
Touring cars had regular saloons with arch gaps stance guys could only dream of, my favourite was the Laguna’s

Le Mans had the 787B, Toyota gt1 and the the Nissan R90CK over boosting the engine to huge power. F1 started with Ferrari v12’s and ended with v10’s
So yeah I’m voting 90’s, but that may be because it’s when I was first getting into watching cars gojng quickly